President Donald Trump will rally Texans for Sen. Ted Cruz in Houston next Monday, Oct. 22, as Cruz’s race with Democratic Rep. Beto O’Rourke enters the home stretch before the Nov. 6 midterm elections there.

Trump had promised in August to campaign on Cruz’s behalf, a promise Cruz heartily welcomed.

“The President looks forward to celebrating the booming Trump economy that’s delivering new jobs and bigger paychecks to the hardworking men and women across the Lone Star State,” Michael Glassner, the chief operating officer of Trump’s 2020 re-election campaign, said in a statement.

The rally will be at Houston’s NRG Arena, which seats slightly less than 10,000 people.

The rally next Monday will be the president’s sixth since he first announced his campaign for the high office in the summer of 2015.

Cruz, one of Trump’s fiercest primary opponents that year, has since cultivated a close relationship with the president, despite Trump suggesting that his father was in on the plot to assassinate John F. Kennedy in Dallas and disparaging his wife’s physical appearance on the campaign trail.

O’Rourke criticized Cruz for associating with someone who would say such things about his family.

“To me it demonstrates that Sen. Cruz will put his political ambition, his prospects in the election ahead of anything else, including his family, including those he’s sworn to represent here in Texas,” O’Rourke told reporters, the Houston Chronicle reported.

Cruz has maintained an uneasy lead over O’Rourke in recent polls despite the Democrat’s campaign raking in a record $38.1 million in the third filing quarter.

That’s more than three times the $12 million figure Cruz posted over the same period — still an impressive haul, by the way.

Texas may be slipping from the bulletproof GOP stronghold it was over the last few decades, but it’s still a reliably red state. Trump won there over Hillary Clinton by 11 points in 2016.

Inside Elections with Nathan L. Gonzales rates the race Likely Republican.

Watch: As Midterms Enter Final Stretch, Senators Ready Their Rallying Cries